| Effect of processing parameters on the mechano-chemical synthesis of nano crystalline Mo-Cu alloy |
| Paper ID : 1061-UFGNSM-FULL |
| Authors: |
|
alireza najari *1, Morteza Saghafiyazdi2, mohammad noghani2 113-Tohhid St-Choubindar town-Qazvin-IRAN 2Department of Materials Science and Engineering, Faculty of Engineering, Imam Khomeini International University, Qazvin, Iran |
| Abstract: |
| In this study, nano-crystalline Mo-Cu alloy has been synthesized via co-reduction of molybdenum trioxide (MoO3) and copper oxide (CuO) with graphite using high energy planetary ball milling and subsequent heat treatment. X-ray diffraction (XRD), differential thermal analysis/thermogravimetric (DTA/TG) and field emission scanning electron microscopy (FE-SEM) techniques were employed to evaluate powder particle characteristics. It was found that mechanical activation of MoO3-CuO and graphite at ambient temperature was unable to complete reduction of mixture oxides. Thermodynamic investigations also confirm the reduction of MoO3-CuO mixture to metallic structure requires thermal activation at higher temperature. The main effect of increased milling time at ambient temperature was decreasing of MoO3 and CuO peaks intensities and significant peak broadening due to decrease in size of crystallites. Four peaks at 400, 500, 600 and 950 °C from DTG results of the mixture sample milled for 10 h were observed which were related to Cu2O, MoO2, Cu and Mo formation respectively, during carbo-thermal reduction of MoO3-CuO mixture. XRD results showed phase composition of the 10 h milled sample with 40% extra graphite after heat treatment at 1000 °C consists of nano-crystalline Mo with a mean crystallite size of 44 nm and 37 nm for Cu calculated from Scherrer equation. |
| Keywords: |
| Nano-crystalline; Mechanical milling; Mo-Cu alloy |
| Status : Paper Accepted (Poster Presentation) |
